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  • Features the same proven technology used in municipal water supplies, Micropur tablets are effective against viruses, bacteria, Giardia and Cryptosporidium
  • Destroys viruses and bacteria in 15 min., Giardia in 30 min. and Cryptosporidium in 4 hrs.
  • Use 1 tablet per quart of water
  • Meets the US Environmental Protection Agency purification guidelines; active ingredient is chlorine dioxide
  • Each tablet is individually wrapped and sealed
  • While a 4 hr. wait time may be inconvenient, alternative disinfectants do not claim to destroy Cryptosporidium

Made in USA.

View all Katadyn Chemical Water Treatments

REI membership


Best Use Backpacking
Filter Type Tablet
Active Ingredient(s) Sodium chloride
Removes/Destroys Protozoa, Bacteria, and Viruses
Output 30 quarts
Weight 0.9 ounce
Rated 4 out of 5 by from more on airline travel I wanted to comment further on flying with this product. I'm leading a trip to India soon and after reading all the comments here and elsewhere had decided that this was the product that worked the best for my group. But the message about the TSA not allowing the tablets onboard was worrisome. I contacted the company (Katadyn) about this. Katadyn argues that the TSA makes exceptions for prohibited items that could be considered "medicinal," and because Micropur "is used to make unsafe water safe to drink to prevent disease from waterborne organisms," it would fall under this category. I thought this might be helpful to others who might be considering the product.
Date published: 2010-03-12
Rated 5 out of 5 by from has a chlorine taste, but not much These don't have a terrible taste at all; they taste like any other tablets would: a slight taste of chlorine. Other reviews say they taste HORRIBLE!!!, this is NOT TRUE. they are very compact and lightweight. I put these in my emergency kit (not all of them, just a few)because they work great.I also keep these in my "not-so-emergency-food/water" section. I haven't used them often, but I use them mainly for purifying water from a stream when i don't bring enough water from home. one piece of advice is: keep them in a small hard plastic container (still in original foil). I use a cleaned out icebreakers sours container thing. the only problem is the taste, and even then, it is not strong at all.
Date published: 2011-06-22
Rated 5 out of 5 by from Micropur is the answer I have been using Micropur as my primary treatment method for over a year now. It is obviously very light and easy to use, with the exception that the foil packs are a little hard to open - I recommend a small scissors like on a multi-tool or knife. I typically only wait 30 minutes unless the water source is really suspect. The only time that I have noticed the taste is when the water is warm. For those cases where taste is an issue, I am planning to add a Aquimira Frontier Pro Filter to my setup - the activated carbon will eliminate most taste. This product is also a good purifier supplement to knock viruses out of pump filtered water, which only takes 15 minutes.
Date published: 2008-03-02
Rated 5 out of 5 by from Tastes good, no problems I always carry these with me, and used them in a setting when I was out of water and had about 7 miles to go, much of it steep (I'd gotten a bit lost and spent quite a bit more time than expected on the hike). I could have made it out without extra water, but it would have been pretty uncomfortable, so I decided to treat the water for an hour and take my chances. The water had no noticeable taste, and I didn't get sick. So while I certainly wouldn't recommend drinking it without the 4 hour wait, I can vouch for the taste, and definitely recommend it for emergency use (or if you can treat water overnight for the next day.)
Date published: 2007-10-08
Rated 3 out of 5 by from I guess it works. I use this product as a backup in-case my filter stops functioning, or if the water is particularly scary. However, the last time I took these out of my little emergency kit, I saw that about half of them had been crushed and in powder form they had broken through small holes the shards poked in the foil. Fine product, but being something so critical as water treatment for backpackers, they should come in a slightly more durable container, something that can hold up to the pressure of being packed snugly and the possibility of water saturation. If you're planning on using these exclusively, do yourself a favor and find some sort of hard case to put them.
Date published: 2008-11-10
Rated 5 out of 5 by from A note on the waiting time ... According to the Katadyn website, the 4 hour wait time to kill cysts is only needed for cold (4 degrees C), dirty water. For 20 degrees C (68 F) water, the wait time is only 30 minutes.
Date published: 2014-05-08
Rated 5 out of 5 by from Lighter than filters & pumps, tastes fin I've backpacked for years. Used pumps, filters, tablets. In my opinion, tablets are the best for ease-of-use, compactness and weight saving. I used to take tablets as a backup, but then got to thinking... why not use them as my primary source of water purification? Yes, you have to wait a bit for them to do their magic. Not a big deal if you use your brain. Some complain about the taste, but I've found that pumps and filters have their own happy taste, so the very slight chlorine taste with tablets is negligible. Pumps are heavy and they can freeze/clog/break (I've had all happen). I have a 3 liter water bladder and I can fill it 2/3 (saves weight and room), drop in 2 tablets and be fine. I take a plastic water bottle (think Evian, cheap, light store-bought) as a backup water container, too, so I can fill one of those and drop in a tablet as well. I haven't used pumps for years now and haven't had any problems at all. And I have no experience outside of North America, so I can only speak to my experiences in the (western) states and Canada. And I don't do a lot of desert hiking, so I think I'd have to alter things a bit for that sort of outing. But for hikes where water is available, these things are great. The plastic does take a tool to cut into (unless you have VERY strong teeth), but I usually have a small knife as well as some ultralight compact scissors, so not a big deal. I'd rather the package be sturdy than risk slight packaging that may fail and tear. Bottom line: love 'em. Hot temps, freezing temps, packing light, no worries.
Date published: 2014-02-10
Rated 5 out of 5 by from My Preferred Water Treatment Method This review is mainly to express why I selected Katadyn Micropur purification tablets as my preferred method to treat water while hiking and backpacking. The benefits of using treatment pills over a filter are weight, space, effort, maintenance and time. The main drawback most people mention is taste. Some treatment pills have more of a taste than others, but really no more than the typical municipal water that comes out of the tap. Straight iodine is the exception. Blech! The Katadyn Micropur purification tablets seemed to have the least taste. In fact, I don’t taste it at all. I think some of it is psychosomatic, where if you think it will taste bad, then it will. Some people use water enhancers (think Mio) to mask the perceived taste. Another negative aspect mentioned is the 30 minute wait time (4 hours for cryptosporidium). If you plan it right by cameling up beforehand, having to wait 30 minutes is not an issue. I don’t know of anyone who waits the full 4 hours. I suppose if you are in an area that is suspect, then the 4 hour time frame would be prudent. But that’s a long time to go without drinking water. There are some two-part water treatments that I did not like. Either I would have to wait 30 minutes to use part 2, or stop on the trail, take off the pack, pull out the bladder, drop in part 2, put the bladder back in, and put the pack back on. What a hassle! I found that the Katadyn Micropur purification tablets dissolve much more quickly than the other tablets. That’s important because you don’t want to just drop in the tablets into a bladder with a hose intake on the bottom and immediately put the bladder in the pack. That’s because I have had the undissolved tablet get into the hose. It makes for a bad first gulp and does not distribute the chemical evenly. If you break up the Katadyn tablets into pieces before dropping them in, after a quick shake, they are completely dissolved. Other commenters noted the difficulty of opening the foil packets. I agree completely. I’m no weakling, and I can barely do it using only my fingers. Rather than having to use a knife or some other implement, a solution I discovered is to use any rock that has any kind of edge. The manufacturers should really pre-cut the edge. On a side note after doing research about using regular household bleach for water purification, I elected to not go that route. First of all, I have tried it and it tastes horrible. Second, for the purpose of water treatment, household beach has a very short shelf life for effective treatment. For purposes of bleaching clothes and household cleaning, the shelf life is much, much longer. Various sources list different lengths of time from 6-12 months before advising to double the amount, or more, to effectively treat water. Cloudy water, or water with invisible particulates needs even more bleach. Higher temperatures degrade household bleach even faster. There are also sources that state household bleach, used in the typical amount for water treatment, does not kill Giardia. So there you have it.
Date published: 2014-10-15
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Will these tablets degrade if I take them out of the foil package and put them in a ziploc bag for the duration of my JMT trip ~20 days?

Asked by: etiwandablues
​We do not recommend removing them from the foil, they will remain secure and dry in the foil; in a Ziploc bag if any wetness gets in, it can degrade them.
Answered by: REIservice
Date published: 2017-02-15

What is the shelf life if left in packaging?

Asked by: Mike1515
​The shelf life is 3 years.
Answered by: REIservice
Date published: 2017-04-27

We have a Katadyn vairo filter. We used the filter several months ago, about 6, and did not flush it with these tablets at that time. If we flush the system now, will the tablets have the same effect? Thanks

Asked by: DanielY
​Yes, it will have the same effect if you flush your system now.
Answered by: REIservice
Date published: 2017-02-13

Will these tablets work to flush a Katadyn Hiker/Hiker Pro filter? Katadyn recommends using Micropur Forte DCCNa or Micropur MP1 but not Micropur Classic.

Asked by: F1Addict
The Micropur Purification Tablets are the same as the Micropur MP1 tablets listed on Katadyn's website. They will work to flush your Hiker or Hiker Pro water filter.
Answered by: REIservice
Date published: 2016-08-18

will these tablets degrade if I remove them from the foil and store them in a ziploc for the duration of my JMT trip ~20days?

Asked by: etiwandablues
Micropur tablets are sealed in foil to ensure moisture does not get to them and cause them to start degrading quickly. We recommend keeping them in their original packaging if at all possible.
Answered by: REIservice
Date published: 2017-02-13

Do these tables have any iodine in them? I have a thyroid problem and my boyfriend is allergic to it, so I have been looking for a purification system that doesn't have any and doesn't have the capacity to break like a water filtration system. 

Asked by: WillowWalker
The Micropur Purification Tablets do not have iodine in them. They are chlorine dioxide tablets.
Answered by: REIservice
Date published: 2017-03-18

Is the active ingredient in these the same as the MSR tablets (Sodium dichloroisocyanurate)? How does the taste of these compare to the MSR tablets?

Asked by: BugDr
The active ingredients in the Micropur tablets are: Sodium chloride- 6.4% Sodium dichloroisocyanurate dihydrate- 1.0%
Answered by: REIservice
Date published: 2015-09-20

Is there any danger of an overdose of chorine dioxide from using 1 tablet meant to treat 1 liter, in a 24 oz. bottled water bottle, or a 20 oz. sport drink bottle?

Asked by: Peter on the Trail
Under normal use, there is absolutely no danger of overdosing using these metrics. However, if you have any physical reaction to iodine, I encourage you to consult your physician for more insight.
Answered by: REIservice
Date published: 2017-04-29
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